Sleep For Mac

Posted : admin On 1/19/2022
  • May 07, 2020 Your Mac must be awake at the time you schedule it to shut down plus 10 minutes. If your Mac is in Sleep mode at the time you schedule it to shut down, it will stay in Sleep mode. If your Mac is set to Sleep after less than 15 minutes of inactivity, it may Sleep before it can Shut Down.
  • Sleep mode (or suspend to RAM) is a low power mode for electronic devices such as computers, televisions, and remote controlled devices.These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to reboot.Many devices signify this power mode with a pulsed.
  • Apr 11, 2019 NoSleep 1.5.1 - Close your MacBook without putting it to sleep. Download the latest versions of the best Mac apps at safe and trusted MacUpdate.

‎NoSleep is an application that you use to prevent your Mac from going to sleep. In 'no sleep' mode there is an option to also disable the screen saver. Note: 1) The purpose of NoSleep is to keep the Mac awake so you can read the screen while not otherwise actively using the Mac.

Macos - Sleep Operation In C++ On OS X - Stack Overflow

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Sleep mode symbol standardized in IEEE 1621

Sleep mode (or suspend to RAM) is a low power mode for electronic devices such as computers, televisions, and remote controlled devices. These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to reboot. Many devices signify this power mode with a pulsed or red colored LED power light.


Sleep For Mac

In computers, entering a sleep state is roughly equivalent to 'pausing' the state of the machine. When restored, the operation continues from the same point, having the same applications and files open.


Sleep mode has gone by various names, including Stand By, Suspend and Suspend to RAM. Machine state is held in RAM and, when placed in sleep mode, the computer cuts power to unneeded subsystems and places the RAM into a minimum power state, just sufficient to retain its data. Because of the large power saving, most laptops automatically enter this mode when the computer is running on batteries and the lid is closed. If undesired, the behavior can be altered in the operating system settings.

A computer must consume some energy while sleeping in order to power the RAM and to be able to respond to a wake-up event. A sleeping PC is a case of a machine on standby power, and this is covered by regulations in many countries, for example in the United States limiting such power under the One Watt Initiative, from 2010. In addition to a wake-up press of the power button, PCs can also respond to other wake cues, such as from keyboard, mouse, incoming telephone call on a modem, or local area network signal.


Hibernation, also called Suspend to Disk on Linux, saves all computer operational data on the fixed disk before turning the computer off completely. On switching the computer back on, the computer is restored to its state prior to hibernation, with all programs and files open, and unsaved data intact. In contrast with standby mode, hibernation mode saves the computer's state on the hard disk, which requires no power to maintain, whereas standby mode saves the computer's state in RAM, which requires a small amount of power to maintain.

Hybrid sleep[edit]

Sleep mode and hibernation can be combined: the contents of RAM are first copied to non-volatile storage like for regular hibernation, but then, instead of powering down, the computer enters sleep mode. This approach combines the benefits of sleep mode and hibernation: The machine can resume instantaneously, but it can also be powered down completely (e.g. due to loss of power) without loss of data, because it is already effectively in a state of hibernation. This mode is called 'hybrid sleep' in Microsoft Windows other than Windows XP.

A hybrid mode is supported by some portable Apple Macintosh computers,[1] compatible hardware running Windows Vista or newer, and Linux distributions running kernel 3.6 or newer.


ACPI (Advanced Configuration and Power Interface) is the current standard for power management, superseding APM (Advanced Power Management) and providing the backbone for sleep and hibernation on modern computers. Sleep mode corresponds to ACPI mode S3. When a non-ACPI device is plugged in, Windows will sometimes disable stand-by functionality for the whole operating system. Without ACPI functionality, as seen on older hardware, sleep mode is usually restricted to turning off the monitor and spinning down the hard drive.

Microsoft Windows[edit]

Microsoft Windows 2000 and later support sleep at the operating system level (OS-controlled ACPI S4 sleep state) without special drivers from the hardware manufacturer. Windows Vista's Fast Sleep and Resume feature saves the contents of volatile memory to hard disk before entering sleep mode (aka Hybrid sleep). If power to memory is lost, it will use the hard disk to wake up. The user has the option of hibernating directly if they wish.

In older versions prior to Windows Vista, sleep mode was under-used in business environments as it was difficult to enable organization-wide without resorting to third-party PC power management software.[2] As a result, these earlier versions of Windows were criticized for wasting energy.[3]

There remains a market in third-party PC power management software for newer versions of Windows, offering features beyond those built into the operating system.[4][5][6] Most products offer Active Directory integration and per-user/per-machine settings with the more advanced offering multiple power plans, scheduled power plans, anti-insomnia features and enterprise power usage reporting. Vendors include 1E NightWatchman,[7][8] Data Synergy PowerMAN (Software)[9] and Verdiem SURVEYOR.[10]


Sleep on Macs running macOS consists of the traditional sleep, Safe Sleep, and Power Nap. In System Preferences, Safe Sleep[11] is referred to as sleep. Since Safe Sleep also allowed state to be restored in an event of a power outage, unlike other operating systems, hibernate was never offered as an option.

In 2005, some Macs running Mac OS X v10.4 began to support Safe Sleep. The feature saves the contents of volatile memory to the system hard disk each time the Mac enters Sleep mode. The Mac can instantaneously wake from sleep mode if power to the RAM has not been lost. However, if the power supply was interrupted, such as when removing batteries without an AC power connection, the Mac would wake from Safe Sleep instead, restoring memory contents from the hard drive.[12]

Safe Sleep capability is found in Mac models starting with the October 2005 revision of the PowerBook G4 (Double-Layer SD[vague]). Mac OS X v10.4 or higher is also required.[13]

In 2012, Apple introduced Power Nap with OS X Mountain Lion (10.8) and select Mac models.[14] Power Nap allows the Mac to perform tasks silently, such as iCloud syncing and Spotlight indexing. Only low energy tasks are performed when on battery power, while higher energy tasks are performed with AC power.[15]


Because of widespread use of this symbol, a campaign was launched to add a set of power characters to Unicode.[16] In February 2015, the proposal was accepted by Unicode and the characters were included in Unicode 9.0.[17] The characters are in the 'Miscellaneous Technical' block, with code points 23FB-FE.[18]

The symbol is ⏾ (⏾)—defined as 'Power Sleep Symbol'.[18]

See also[edit]



  1. ^'About safe sleep'. Apple Inc. Archived from the original on April 2, 2012.
  2. ^'PowerMAN PC Power Management Software Documentation'.
  3. ^'EcoGeek - How Windows XP Wasted $25 Billion of Energy'.
  4. ^'Power Management Software for Windows Workstations'.
  5. ^'Activating Power Management: Commercial Software Packages'.
  6. ^The Headmasters' and Headmistresses' Conference. 'HMC: A Practical Guide to Sustainable Building for Schools'. Archived from the original on 2012-03-15.
  7. ^'PC Power Management Solutions'. IT Managers Inbox. May 26, 2009.
  8. ^'Why use software NightWatchman to turn your PCs off?'.
  9. ^'Keeping IT Clean: energy and the networked computing environment'.
  10. ^'1E upgrades NightWatchman, seeks to bring powermanagement to SMEs: Competitive landscape'(PDF). Archived from the original(PDF) on 2011-07-07.
  11. ^'OS X Lion: What is safe sleep?'.
  12. ^'What is safe sleep on Mac?'. Apple Support.
  13. ^'How to Safe Sleep (Hibernate) Your Mac -'. January 5, 2008.
  14. ^LLC, Kyle Media. 'What is Power Nap? Power Nap Macs & Hack Possibilities @'. Retrieved 2017-02-02.
  15. ^'How Power Nap works on your Mac'. Apple Support. Retrieved 2017-02-02.
  16. ^'Unicode Proposal 14009 Power Symbol'(PDF). Unicode. Unicode Consortium. Retrieved Dec 23, 2015.
  17. ^West, Andrew (2016-01-10). 'What's new in Unicode 9.0?'.
  18. ^ ab'Unicode Chart - Miscellaneous Technical - Range: 2300–23F'(PDF). 2016-06-22.
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Your Mac computer is set to go to sleep after a certain amount of time in order to help conserve power or your laptop’s batteries. However, it can be annoying if your computer is going to sleep when you don’t want it to. Here’s how to turn off sleep mode on a Mac using System Preferences and keep it awake with third-party apps.

How to Turn Off Sleep Mode on a MacUsing System Preferences

To turn off sleep mode on a Mac, goto System Preferences > Energy Saver. Then tick the box nextto Prevent computer from sleeping automaticallywhen the display is off and drag the Turn display off after sliderto Never.

  1. Open the Apple menu. You can do this by clicking the Apple icon in the top-left corner of your screen.
  2. Then select System Preferences.
  3. Next, select Energy Saver. This is the icon that looks like a light bulb.
  4. Tick the box next to Prevent computer from sleeping automatically when the display is off.
  5. Then untick the box next to Put hard disks to sleep when possible.
  6. Finally, drag the Turn display off after slider to Never.

No Sleep For Mac

Note: If you are using a laptop, you will only see this option if you click the Power Adapter tab at the top of the window. You can also change these settings in the Battery tab as well.

How to Turn off Sleep Mode on a Mac Using Apps

While it is easy for most people to preventtheir Macs from going into sleep mode following the steps above, there are appsavailable that let you tweak your sleep settings even more.

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Amphetamine is an app designed to keep your Mac wide awake by using triggers. You can easily set up the triggers to keep your Mac awake when an external display is plugged in, a specific app is running, and more. Then you can also toggle the on/off switch in the main interface to stop the triggers. You also have full control of how your computer behaves when you’re away, whether it goes to sleep, activates the screen saver, and many other actions.


If you want to control your Mac’s sleeping preferences with a simple interface, then the Owly app is your best bet. This app features a small icon that lives in the Menu Bar at the top of your screen. Clicking it will open up a menu that lets you prevent your Mac from sleeping for a set amount of time.

Imac Sleep Mode Settings

Now that you know how to turn off sleep mode on your Mac, check out our guide on how to turn off sleep mode on a Windows 10 PC.

Updated on May 5, 2020

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